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NATURAL RADIATIVE lifetime.MEASUREMENT OF Sm ATOMS IN HIGH-EXCITED STATE

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Chinese Science Bulletin 1991年第5期36卷 387-389页

作者：王成飞周大凡王大地蒋占魁 Chanchhun Institute of Applied Chemistry Academia Sinica Changchun 130022 PRC Department of Physics Jilin University Changchun 130023 PRC

Ⅰ. INTRODUCTIONNatural radiative lifetime.of rare-earth elements has been studied extensively during the last few years. But most of these studies are limited to the low-excited states. Up to now, no data about the lifetime.of Sm atoms in high-excited state are known. The energy level of Sm measured belongs to odd-parity state and is less than 30,000 cm-1.

关键词： stepwise excitation high-excited state natural radiative lifetime.

Energy transfer processes in phycobilisome model complex at 77 K

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Science China Chemistry 2000年第3期43卷 233-239页

作者：王慧赵井泉蒋丽金 Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China Institute of Photographic Chemistry Chinese Academy of Sciences Beijing 100101 China Institute of Photographic Chemistry Chinese Academy of Sciences Beijing 100101 China

Ultra time-resolved fluorescence spectra were used to study the energy transfer processes and mechanism of complex PEC/PC/APC at 77 K, which was reconstructed with phycobiliproteins (PEC, PC and APC) ofAnabaena variabilis, and has intact light-harvesting system and single terminal emitter. The energy transfer relationships between different chromophores especially between rod and core were also discussed based on fluorescence decay kinetic under different detected wavelengths. As a result, we got the possible energy transfer pathways and transfer time constants to be 29 ps between two PEC trimers, 12 ps between PEC and C-PC, 51 ps between rod and core.

关键词： PBS model complex energy transfer time-resolved fluorescence spectra lifetime.

Measurements of excitation spectra and level lifetime. for highly charged neon ions

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Science China Mathematics 1997年第3期40卷 285-289页

作者：王友德马新文杨治虎杜一飞刘惠萍赵孟春郭天瑞王春芳 Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China

Beam foil experiments were carried out for 47 MeV Ne ions passing through C (39 μg/cm2) and Al (3 4mg/cm2) foils. Highly charged H-, He-, Li-, and Be-like ions were obtained after the foils. The excitation spectra and level lifetime. for these ions were measured, and transition configurations for most measured lines were identified

关键词： beam foil technique highly charged ions excitation spectrum level lifetime.

Fluoroscence Phenomena-New Properties of Hexakis(4-Aminophenoxy)Cyclotriphosphazene

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Chinese Chemical Letters 2003年第5期14卷 535-538页

作者： Xiang Wen WU Du Xia CAO Zhi Qiang LIU Xiu Feng CHENG Chang Shui FANG* Min WANG Zhuo WANG State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100

Investigations of the absorption and fluorescence spectra of hexakis (4-aminophenoxy)- cyclotriphosphazene at room temperature in three solvents of different polarity (N, N-dimethyl- formamide, tetrahydrofuran and toluene) have been conducted. And fluorescence lifetime. of these three solutions were also measured. Major reasons of such spectral behavior are discussed.

关键词： Hexakis(4-aminophenoxy)cyclotriphosphazene absorption fluorescence lifetime.

LiNbO_3/p^+n diode surface acoustic wave memory correlator

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Science China(Technological Sciences) 1997年第5期40卷 497-504页

作者：张朝水永安印建华 Institute of Acoustics Nanjing University Nanjing 210093 China

A detailed theoretical analysis of strip-coupled LiNbO3/p+ n diode surface acoustic wave (SAW) memory correlator in the parametric mode is presented. The influence of some important factors on correlation output is analyzed and calculated, including the amplitudes of reference, read and write signal, duration of write signal and doping density of the diode array. The conclusions can be employed for the design of improved strip-coupled SAW memorycorrelators.

关键词： memory correlator diode array SAW tapped delay line minority carrier lifetime.

MEASUREMENT AND CALCULATION OF SPONTANEOUS EMISSION BRANCHING RATIOS, RELATIVE OSCILLATOR STRENGTHS, TRANSITION PROBABILITIES AND LEVEL lifetime. FOR ATOMIC URANIUM

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Science China Mathematics 1990年第6期33卷 677-685页

作者：金巨广王松岳孙孝忠徐俊王文韵 Changchun Institute of Applied Chemistry Academia Sinica Changchun 130022 PRC

We propose a laser induced sensitized fluorescence spectrometry for measuring the spontaneous emission branching ratios o?the transitions from the ten levels 5f36d7s7p-7M7, 5f36d7s7p-7L6, 5f37s27p-5K6, 5f26d27s2 - 5L7, 5f46d7s - 7L6, (17,070cm-1)-5L6, 5f26d27s2-5K6, 6d7s7p-7L5, 5f36d7s7p-7K5 and 5f26d27s2-5I5 to the ground state of atomic uranium (UI) for the first time. Their relative oscillator strengths have been measured by means of hollow cathode discharge (HCD) emission spectrometry. The radiative lifetime. and the spontaneous emission transition probabilities of these levels have been measured and calculated. High measuring accuracy and resolution have been obtaind.

关键词： laser-induced fluorescence branching ratio oscillator strength transition probability level lifetime.

A WAY OF CONNECTION Sharing Time and Space at The Salon

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城市漫步（GBA版） 2016年第12期 47-47页

作者： Jocelyn Richards Anthony Rowley(图) 不详

Very rarely in life do two wholly compatible strangers cross *** it might happen in an instant-on a plane or in line for coffee-the ripples of im-pact are felt for a lifetime.

关键词： lifetime. instant plane